Liquid dispensing pump



June 9, 1931. T. H. scHUTT LIQUID DISPENSING PUMP Filed April 19, 1929 INVENTOR Teodora Sc/)uff f'Patengee'Jeieulesia i l 1,809,814-

j vTHEOberm'1i.'scaturiti", oiF ciLEvrtANufoHIo 'j i'IQU-ISDISENSINGPUMP Y y Y ppncafitn'ieeiliprii 1e, 1925?; serial'Nlo. $56,524. n Y y The present irivei'itio'n irelgi-trys*ft-oik heilig miiitztiiiediii the dishgf Outat'aj pumps for soda' fountains andthelike levelclose tothe disehergeoutlet, t e liquidi for its object to provide et pump? vii'viriieh y*A'cljelivZ-f Willibegiu to Ailofvvfrom the outlet immediate# ers'ei'i. accurately' measured quantityof liq- -l'yl'ztfter thepressure l'strokeis startedLAn" 5 uid at each' stroke rid in whichV the liquid ijs ,eveiijdisehrge isthus 'obtained kduring the 55v dischergediu a' steady stre/ttm during' the en-f. pressure `stroke so that suddeny rush ,ofliq'uidi tire pressure strokey oftheipuriip; n tothe discharge 'spoutj'vviitli thetederupeny-4 A further 'object is 'to provide e pump mgs'purtiu'g' g and. splashing/of liquid Vis' Y, which maintainstheliquid level iii*tiieidis`` avoidedif] y n t i l Charge spout `Vsite point slightly'helovv' the i the above uii'dfothejr yobjects 'iiijviefug 60 discharge opening of the spout'duringthe tliejiventiou maybe" Ldit() eomprisethe' de-y iritervals between operation ofjthe plunger' viefe as 4opillustrated""ink the yvafe'eoiupan'yig.

sothet the discharge fromthe spout begins ,'drgtviiigsphei'eiiiafterdeseribed tudI partiell! y immediately upon thebegiimin'gofthedoivu l'aly' set forth 'ini'l fi`pl3-loled' Cleiiiis,t to@y p t 5 stroke .of the'pluiiger yfind is positively' Vout of j gethe'r. with sueh variations uiidmodfieae 65;

' at the beginningv of the lup stroke' ofthe( tions' thereoffas :Will/[bef apparent'to one, plunger so thatv spurtirig and splashiiig 0`f` skilledjiri'theurt tow'vhieh the iuvertior 'apf-v( the liquid due toztiushiof liquid throughthe perteinsg';

. spout is prevented'gfztnd*dripping offliquid* g' Reer 'ce Should heh-dto thegtceompayl from' the vspc'iutrgtfterfthecompletionfof vthe forming partofthespeeiiie- 7UV compression stroke,is*avoided*loythelowerev @ign in. n n p ingof the level @it theliquidtw poum be Figufeiweideeievauif of the pump' IOW, the'd'scharge opening'. with a portienofthehed broken Wayland-g rI'he present invetion*provides @pump shown @Sectional inlet 'Chamber reeeiving'liquidfrom the'eouthepump Casin-gg hle nd'alged t 2mg; tailler vand delivering it toltlie outlet'ohamber i'Fig-v-3. f g p andthe outlet' chamber deliveriiigsthe verti'c'ulfs'e'etiil taken Centrally* tothe spout. VMezmsis providedf0ij's1niu-l-` through ,the pump ca'singpy g taneously vrying the eapaeitiesof tlieehztrij L .Fig-g4 is lziiseeti'oiis' teken `offthe"liIie-indi-n 8'0 hers to drewfv liquidir'ito the *inlet*diamleer'v cated-gti: -in Fg ,3- A 1 f YWhile liquid isbeiiig disehargedfrm the outf" 1, ngt@ the i acmpnyng d-awig-S let ehaiiiloerr und'to diseliarg'eliquid IQIii the iliveitionisfhereiii illustrated-s applied o inlet chamber into the outlet ehumberjdurmg Off gyfup pumpfpgf the type' employed in therreturn stroke. f Q

A The variation 'rifthe capaeityofthe vdisportediii the Syrup 'receptele by :ineens da charge Chamber iS' milde ShghtBfgrwtG' cvefrtting @opening inthe top'of the' re'-v than the variati@ ill-the' Capacity-,0f the lil-f LCep"fil'le". AS shown. hreifh Pufrips Pf6? take" Chamber `seatbelt during the returii Or vidvedswith fhed itin' the' form' o' a' @over .Y

uid is drawn from theoutlet oo'iiduity y'back into Syrup, fe-ptad g and-this had'spmvded;

ing to the lower end thereof and extending upwardly along the side of the casing 5, the pipe 7 being in communication with the upper end of the passage. On the opposite si e of the casing, there is an inlet passage 10 which opens into the cylinder at its upper end and extends down along the wall of the pump casing to the bottom of the casing, an upwardly opening check valve 11 being provided in the lower end of the inlet passage which permits flow of liquid into the casing, but prevents reverse How.

Within the cylinder 8, there is mounted a plunger 12 to which is attached a plunger rod 13 which extends upwardly through a boss 14 in the top ofthe casing. The plunger 12 divides the cylinder into an upper inlet chamber and a lower outlet chamber, the inlet chamber communicating with the inlet passage 10 and outlet chamber with the outlet passage 9.

In order to prevent leakage of liquid through the top of the pump casing along the surface of the plunger rod, a bearing ring 15 is loosely mounted on the rod 13 between the plunger and the top of the casing. This bear- 1ng ring engages with the top wall of the casin on the up stroke of the plunger and provi es an effective seal at the end of the up stroke when the ressure in the inlet chamber might tend to orce liquid upwardly along the surface of the plunger rod, and through the top of the casing. In ordery to permit flow of liquid from the inlet chamber to the outlet chamber, a by-pass 16 is provided throu h the ylunger and this by-pass is controlled by a ownwardly opening check valve 17, which permits flow of liquid downwardly through the plunger during the u -stroke of J the plunger and prevents reverse ow during the downstroke of the plunger. v

A by-pass 18 establishes communication between the outlet passage 9 and the top portion of the inlet chamber so that a small quantity of liquid may flow from the outlet conduit into the inlet chamber to supply liquid to the inlet chamberin addition to that drawn through the inlet so as to keep the inlet chamber full of liquid. At the upper end thereof, the plunger rod has a knob 19 by which` it may be pushed downwardly to discharge lquidthrough the spout, the plunger rod extendingA up through the head 1.a sufricientk distance to glive convenient access tothe upper end oft ye rod. The plunger rod 13 extends through a sleeve 2O rotatablymounted centrally in the heador cover 1 and this sleeve is internally threaded to receive `one or more adjusiable threaded bearing members 21 in which the plunger rod is slidably keyed. ,A coil spring 22 surrounds theplunger rod and is interposed between the bearing members 21 and theknob 19 so. that the plunger rod'and plunger are yautomatically returned to their uppermost position after being depressed pressure on the knob 19. By rotating the sleeve 20, the bearing members 21 may be adjusted up or down and the extent of downward movement of the plunger may be varied to vary the quantity of liquid discharged at one stroke of the plunger.

,In the operation of the pump, the plunger is depressed by pressing downwardly-on the knob 19, causing an increase in the capacity of the inlet chamber, and consequently, sulicient suction to draw liquid through the inlet kThe pump has a diiferential action by,

reason of the fact that at each stroke, more liquid is forced from the discharge chamber than is drawn into the inlet chamber. This is for the reason that the variation in the capacity of the discharge chamber is greater than the variation of the capacity of the inlet chamber. lVhen the lunger moves down- Wardly to the bottom o the outlet chamber, the entire contents of the chamber, i. e., the amount of liquid which it contains when vthe plunger is in the position shown in Fig. 3 is forced from the outlet chamber. At ythe same time, the lowering of the plunger increases the capacity of the inlet chamber and draws liquid through the passage 10 into the inlet chamber. The increase in the capacity of the inletchamber, however, is not as great as the decrease in the capacity of the outlet chamber for the reason that the plunger rod 13 moves down into the cylinder as the plung-l er is lowered and displaces an amount of liquid corresponding tothe volume of the ortion of the rod'moved into the cylinder. he result is that at each up stroke ofthe plunger, a portion of the liquid is drawn back from the outlet passage 9 into the discharge chamber,-the amount so drawn from the outlet passage corresponding to the difference in the displacement of liquid by the lunger in the two chambers, the volume ofp liquid so drawn vfrom 'the` outlet passage being equal to the volume of the portionof the plunger rod which movesinto the cylinder on the down stroke of the plunger. This back flow into the pump from the outlet conduit causes a positive back flow away from the discharge openingto a level slightly below the opening immediately upon release of theplunger, so

that the flow t rough the 'outlet of the out is positively discontinuedat the end o the vis forced from the pump" pressure stroke. lThe level of the liquidiin l the discharge conduit, however, remains quite close to the opening of the discharge spout empty discharge conduit.

lt will be apparent thatthepresent invention provides a pump which accuratelymeas-v ures the quantity discharged lat each strolre which discharges the liquid ina steady stream and which positively Vcuts oil the flow and prevents dripping after the completiony of the stroke of the plunger. l' Furthermore, it is to be'understood-that the particular termici apparatus shown and de- Y scribed, and the particular procedure set liquid.A

-means for admittin0r liquid from the inle forth are presented for purposes of 'explanation and illustration and that various modiications of. said apparatus and procedure can be made'without departing from my invenf tion as deiined in the appended claims.

l/Vhat l claim is:

l. A pump or the character Vdescribed hav-v ing an inlet chamber and an outlet chamber, means for simultaneously. and inversely varyingthe capacities of the two chambersY with a greater variation in the capacity ofthe out` lect chamber than in the capacity of the inletk chamber, means for admittingliquid tothe inletchambzerirwhile its VVcapacity is being in5- creased and for preventing reve-rse iiow,

chamber to the outlet chamber while the capacity of the outlet chamber-is being `in-` creased and for preventingreverse flow., a dis charge spout communicating with the out--` let chamber andipcsitioned above the same,` and a by-pass leading from,V said discharge spout to said inlet chamber permitting said inlet chamber to be completely filled with A Vsyrup pump comprising a Ymeasur`` ine' cylinder having an inlet chamber and an outlet chamber, means including a differential 2 plunger interposed between the chambers,for

' simultaneously and inversely varying the cafL pacities oi' the 'two chambers :with a greater variation in the capacity of the. outlet chaniber than inthe capacity? of theinlet cha-mf ber, means for admitting liquid to the inletl chamber While its capacity is being increased and for preventing reverse low, means for admitting liquid from the inlet chamber to the outlet chamber while the capacity of the Y. outlet chamber is being increased and for preventing reverse flow, ya discharge spout in open communication with the outlet'chamber and positionedabove the same, and a by-pass j above said inlet chamber andl leading there.l

f into from said-discharge spout toy permit a mg dischargespoutthereomacylinder kmunicati'ng with said pipe with the cylin-y yand means torloperatingsaid pli1nger,'anda inlet y, passage extending from f ad-jacen bottom 'of the;l 'casi-ng andfopennig vintov said ,said cylinder, and means 'for` actuating' said,

portion ofi the Y undischarged liquid 'ein' said spout to :flow back into saidinlet chamberand nuites ,t f

I Aisyrup ngahead-h"y casing; below 'the head, al pipe conne g the spcut .withsjaid casing, a plungeilrodfsl-iclable c in ai@ had .and "extending down also' sad casing,'a plungerin 'thefcasing connectedtok l p said rod,sa1d plunger `'havingy anbpenlng'and "75 ay valve@ controllingqsaidopening,` anl inlet passa'gey c',ommunicatnig` with the cyh'n derabovethe' plunger, a 'check valve in the inlet passagev and/an outlet passagel com;y

derbeldw thelplungen y 4 fsyru'pf pumpjcoinprisin'g fa 'measuring cylinder 'having 'a reciprocating plunger,

a discharge spout abovesaid cylinder, a con duit conn cting"`the spoutto one end ofv said cyliiid'en'ian inletatfthe opposite endfof saidcylindei, arbypass from one side of the-piston tothe other, a check valve controlling said bypass', acheclr valve controlling said inlet,

by-passy leading downwardly from said con? duit to ythe inlet side of said cylinder ,to per 1mitundischwarged liquid in said conduit tofreVV Y turn land lill space in said cylinder above said pump., j Y y Y "5.' .In 'a syrup pump, ahead, ajcasing sup#l ported below said headfand having a cylinder closed ati its ends, .adischargef passage adj a! centfa side-of lsaid cylinder and openingltlieieintot the lowerendjthereo'f, and fan inlet passage ace'i'itrafside4 ofsaidy cylinder Ton cylinder"theuplperr endtherei', aipis on in 7*6; Ina's'yrupported below said head and having a cylinder l ipum'p, "a heath-a casing supclosed' atits ends, a' discharge passage integrally ormedwith and adjacent to a side of 1in said cylinder, said passage communicating with said cylinder at the bottomV end thereof,

and an inlet passage'integrally kformed with thereintoat the lower endthereof, an inlet 125 passage adjacenta side of said.' cylinder, said M rvinlet passage extending from adjacent the bottomfofysaid casing, and opening into said cylinder, rod means extending through said casing for actuating said p1ston,'and a removable cap portion in the lower end of said casing to permit cleaning of said cylinder.

8. In a syrup pump, a head, a casin supported below saidhead and having a cy 'nder U closed at its ends, a discharge passage adjacent a side of said cylinder and opening thereinto at the lower end thereof, an inlet pas-l sage adjacent a side of said cylinder, said inlet passage extending kfrom adjacent the bottom of said casing and opening into said cylinder, having a by-pass valve operatable on the up stroke to permit liquid to flow`from the upper to the lower end of said cylinder, rod means extending through the top of said, casing for actuating said piston,

and a check valve in said inlet passage operatable on the down stroke of said piston to permit liquid to enter the upper side of said cylinder above said piston. Y 9. In a syrup pump, a head, a casing supported below said head and having a cylinder closed at its ends, a discharge passage adjacent a side of said cylinder and opening thereinto at the lower end thereof, an inlet passage adjacent a side of said cylinder, said inlet passage extending from adjacent the bottom of said casing and opening into said cylinder, having a by-pass valve operatable on the up stroke to permit liquid to so ilow from theupperto thelower end ofsaid cylinder, rod means extending through the top of said casingfor actuating said piston, a check valve in said inlet passage operatable on the down stroke of said piston to permit liquid sa to enter the upper side of said cylinder above said piston, and a by-pass providing communication between said discharge passage and the side of said cylinder above said pump, whereby liquid may flow from said passage ,#40 to ll the chamber at the inlet side thereof.

In testimony whereof I affix my si y ature.

THEODORE H. SC UTT. 

